<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // 浅拷贝，把对象第一层的属性和值，拷贝给另一个对象
    let obj1 = { title: 'aaaaaa', subject: '前端' }
    // let obj2 = obj1 // 直接赋值，赋值的是地址
    // obj2.title = 'bbbbb'
    // 浅拷贝：
    let obj2 = {
      uname: 'aa',
      age: 20,
      ...obj1
    }
    obj2.title = 'bbbbbb'
  </script>
</body>

</html>